ok, so it's running DBCC CHECKDB ('database_name') WITH PHYSICAL_ONLY
If you check DBCC CHECKDB is Books online it should provide you with the information your need.
There is no problem with using the database while CheckDB is being run, however it will slow the system down. There is no need for this to be run daily. For my large databases I run checkdb weekly, on the weekends so as to not effect users.
Denny